
(function (root, factory) {

    /* CommonJS */
    if (typeof exports == 'object') module.exports = factory()

        /* AMD module */
    else if (typeof define == 'function' && define.amd) define(factory)

        /* Browser global */
    else root.Spinner = factory()
}
(this, function () {
    "use strict";

    var prefixes = ['webkit', 'Moz', 'ms', 'O'] /* Vendor prefixes */
      , animations = {} /* Animation rules keyed by their name */
      , useCssAnimations /* Whether to use CSS animations or setTimeout */

    /**
     * Utility function to create elements. If no tag name is given,
     * a DIV is created. Optionally properties can be passed.
     */
    function createEl(tag, prop) {
        var el = document.createElement(tag || 'div')
          , n

        for (n in prop) el[n] = prop[n]
        return el
    }

    /**
     * Appends children and returns the parent.
     */
    function ins(parent /* child1, child2, ...*/) {
        for (var i = 1, n = arguments.length; i < n; i++)
            parent.appendChild(arguments[i])

        return parent
    }

    /**
     * Insert a new stylesheet to hold the @keyframe or VML rules.
     */
    var sheet = (function () {
        var el = createEl('style', { type: 'text/css' })
        ins(document.getElementsByTagName('head')[0], el)
        return el.sheet || el.styleSheet
    }())

    /**
     * Creates an opacity keyframe animation rule and returns its name.
     * Since most mobile Webkits have timing issues with animation-delay,
     * we create separate rules for each line/segment.
     */
    function addAnimation(alpha, trail, i, lines) {
        var name = ['opacity', trail, ~~(alpha * 100), i, lines].join('-')
          , start = 0.01 + i / lines * 100
          , z = Math.max(1 - (1 - alpha) / trail * (100 - start), alpha)
          , prefix = useCssAnimations.substring(0, useCssAnimations.indexOf('Animation')).toLowerCase()
          , pre = prefix && '-' + prefix + '-' || ''

        if (!animations[name]) {
            sheet.insertRule(
              '@' + pre + 'keyframes ' + name + '{' +
              '0%{opacity:' + z + '}' +
              start + '%{opacity:' + alpha + '}' +
              (start + 0.01) + '%{opacity:1}' +
              (start + trail) % 100 + '%{opacity:' + alpha + '}' +
              '100%{opacity:' + z + '}' +
              '}', sheet.cssRules.length)

            animations[name] = 1
        }

        return name
    }

    /**
     * Tries various vendor prefixes and returns the first supported property.
     */
    function vendor(el, prop) {
        var s = el.style
          , pp
          , i

        prop = prop.charAt(0).toUpperCase() + prop.slice(1)
        for (i = 0; i < prefixes.length; i++) {
            pp = prefixes[i] + prop
            if (s[pp] !== undefined) return pp
        }
        if (s[prop] !== undefined) return prop
    }

    /**
     * Sets multiple style properties at once.
     */
    function css(el, prop) {
        for (var n in prop)
            el.style[vendor(el, n) || n] = prop[n]

        return el
    }

    /**
     * Fills in default values.
     */
    function merge(obj) {
        for (var i = 1; i < arguments.length; i++) {
            var def = arguments[i]
            for (var n in def)
                if (obj[n] === undefined) obj[n] = def[n]
        }
        return obj
    }

    /**
     * Returns the absolute page-offset of the given element.
     */
    function pos(el) {
        var o = { x: el.offsetLeft, y: el.offsetTop }
        while ((el = el.offsetParent))
            o.x += el.offsetLeft, o.y += el.offsetTop

        return o
    }

    /**
     * Returns the line color from the given string or array.
     */
    function getColor(color, idx) {
        return typeof color == 'string' ? color : color[idx % color.length]
    }

    // Built-in defaults

    var defaults = {
        lines: 12,            // The number of lines to draw
        length: 7,            // The length of each line
        width: 5,             // The line thickness
        radius: 10,           // The radius of the inner circle
        rotate: 0,            // Rotation offset
        corners: 1,           // Roundness (0..1)
        color: '#000',        // #rgb or #rrggbb
        direction: 1,         // 1: clockwise, -1: counterclockwise
        speed: 1,             // Rounds per second
        trail: 100,           // Afterglow percentage
        opacity: 1 / 4,         // Opacity of the lines
        fps: 20,              // Frames per second when using setTimeout()
        zIndex: 2e9,          // Use a high z-index by default
        className: 'spinner', // CSS class to assign to the element
        top: 'auto',          // center vertically
        left: 'auto',         // center horizontally
        position: 'relative'  // element position
    }

    /** The constructor */
    function Spinner(o) {
        if (typeof this == 'undefined') return new Spinner(o)
        this.opts = merge(o || {}, Spinner.defaults, defaults)
    }

    // Global defaults that override the built-ins:
    Spinner.defaults = {}

    merge(Spinner.prototype, {

        /**
         * Adds the spinner to the given target element. If this instance is already
         * spinning, it is automatically removed from its previous target b calling
         * stop() internally.
         */
        spin: function (target) {
            this.stop()

            var self = this
              , o = self.opts
              , el = self.el = css(createEl(0, { className: o.className }), { position: o.position, width: 0, zIndex: o.zIndex })
              , mid = o.radius + o.length + o.width
              , ep // element position
              , tp // target position

            if (target) {
                target.insertBefore(el, target.firstChild || null)
                tp = pos(target)
                ep = pos(el)
                css(el, {
                    left: (o.left == 'auto' ? tp.x - ep.x + (target.offsetWidth >> 1) : parseInt(o.left, 10) + mid) + 'px',
                    top: (o.top == 'auto' ? tp.y - ep.y + (target.offsetHeight >> 1) : parseInt(o.top, 10) + mid) + 'px'
                })
            }

            el.setAttribute('role', 'progressbar')
            self.lines(el, self.opts)

            if (!useCssAnimations) {
                // No CSS animation support, use setTimeout() instead
                var i = 0
                  , start = (o.lines - 1) * (1 - o.direction) / 2
                  , alpha
                  , fps = o.fps
                  , f = fps / o.speed
                  , ostep = (1 - o.opacity) / (f * o.trail / 100)
                  , astep = f / o.lines

                ; (function anim() {
                    i++;
                    for (var j = 0; j < o.lines; j++) {
                        alpha = Math.max(1 - (i + (o.lines - j) * astep) % f * ostep, o.opacity)

                        self.opacity(el, j * o.direction + start, alpha, o)
                    }
                    self.timeout = self.el && setTimeout(anim, ~~(1000 / fps))
                })()
            }
            return self
        },

        /**
         * Stops and removes the Spinner.
         */
        stop: function () {
            var el = this.el
            if (el) {
                clearTimeout(this.timeout)
                if (el.parentNode) el.parentNode.removeChild(el)
                this.el = undefined
            }
            return this
        },

        /**
         * Internal method that draws the individual lines. Will be overwritten
         * in VML fallback mode below.
         */
        lines: function (el, o) {
            var i = 0
              , start = (o.lines - 1) * (1 - o.direction) / 2
              , seg

            function fill(color, shadow) {
                return css(createEl(), {
                    position: 'absolute',
                    width: (o.length + o.width) + 'px',
                    height: o.width + 'px',
                    background: color,
                    boxShadow: shadow,
                    transformOrigin: 'left',
                    transform: 'rotate(' + ~~(360 / o.lines * i + o.rotate) + 'deg) translate(' + o.radius + 'px' + ',0)',
                    borderRadius: (o.corners * o.width >> 1) + 'px'
                })
            }

            for (; i < o.lines; i++) {
                seg = css(createEl(), {
                    position: 'absolute',
                    top: 1 + ~(o.width / 2) + 'px',
                    transform: o.hwaccel ? 'translate3d(0,0,0)' : '',
                    opacity: o.opacity,
                    animation: useCssAnimations && addAnimation(o.opacity, o.trail, start + i * o.direction, o.lines) + ' ' + 1 / o.speed + 's linear infinite'
                })

                if (o.shadow) ins(seg, css(fill('#000', '0 0 4px ' + '#000'), { top: 2 + 'px' }))
                ins(el, ins(seg, fill(getColor(o.color, i), '0 0 1px rgba(0,0,0,.1)')))
            }
            return el
        },

        /**
         * Internal method that adjusts the opacity of a single line.
         * Will be overwritten in VML fallback mode below.
         */
        opacity: function (el, i, val) {
            if (i < el.childNodes.length) el.childNodes[i].style.opacity = val
        }

    })


    function initVML() {

        /* Utility function to create a VML tag */
        function vml(tag, attr) {
            return createEl('<' + tag + ' xmlns="urn:schemas-microsoft.com:vml" class="spin-vml">', attr)
        }

        // No CSS transforms but VML support, add a CSS rule for VML elements:
        sheet.addRule('.spin-vml', 'behavior:url(#default#VML)')

        Spinner.prototype.lines = function (el, o) {
            var r = o.length + o.width
              , s = 2 * r

            function grp() {
                return css(
                  vml('group', {
                      coordsize: s + ' ' + s,
                      coordorigin: -r + ' ' + -r
                  }),
                  { width: s, height: s }
                )
            }

            var margin = -(o.width + o.length) * 2 + 'px'
              , g = css(grp(), { position: 'absolute', top: margin, left: margin })
              , i

            function seg(i, dx, filter) {
                ins(g,
                  ins(css(grp(), { rotation: 360 / o.lines * i + 'deg', left: ~~dx }),
                    ins(css(vml('roundrect', { arcsize: o.corners }), {
                        width: r,
                        height: o.width,
                        left: o.radius,
                        top: -o.width >> 1,
                        filter: filter
                    }),
                      vml('fill', { color: getColor(o.color, i), opacity: o.opacity }),
                      vml('stroke', { opacity: 0 }) // transparent stroke to fix color bleeding upon opacity change
                    )
                  )
                )
            }

            if (o.shadow)
                for (i = 1; i <= o.lines; i++)
                    seg(i, -2, 'progid:DXImageTransform.Microsoft.Blur(pixelradius=2,makeshadow=1,shadowopacity=.3)')

            for (i = 1; i <= o.lines; i++) seg(i)
            return ins(el, g)
        }

        Spinner.prototype.opacity = function (el, i, val, o) {
            var c = el.firstChild
            o = o.shadow && o.lines || 0
            if (c && i + o < c.childNodes.length) {
                c = c.childNodes[i + o]; c = c && c.firstChild; c = c && c.firstChild
                if (c) c.opacity = val
            }
        }
    }

    var probe = css(createEl('group'), { behavior: 'url(#default#VML)' })

    if (!vendor(probe, 'transform') && probe.adj) initVML()
    else useCssAnimations = vendor(probe, 'animation')

    return Spinner

}));

var loading = function (params) {

    "use strict";

    var overlayDOM;
    var noop = function () { };
    var defaults = {
        onbeforeshow: noop,
        onshow: noop,
        onbeforehide: noop,
        onhide: noop,
        text: "",
        icon: null,
        spinner: null,
        duration: null,
        id: null,
        parentEl: null
    };

    // helper - merge two objects together, without using $.extend
    var merge = function (obj1, obj2) {
        var obj3 = {};
        for (var attrOne in obj1) { obj3[attrOne] = obj1[attrOne]; }
        for (var attrTwo in obj2) { obj3[attrTwo] = obj2[attrTwo]; }
        return obj3;
    };

    // helper - does it support CSS3 transitions/animation
    var doesTransitions = (function () {
        var b = document.body || document.documentElement;
        var s = b.style;
        var p = 'transition';
        if (typeof s[p] === 'string') { return true; }

        // Tests for vendor specific prop
        var v = ['Moz', 'Webkit', 'Khtml', 'O', 'ms'];
        p = p.charAt(0).toUpperCase() + p.substr(1);
        for (var i = 0; i < v.length; i++) {
            if (typeof s[v[i] + p] === 'string') { return true; }
        }
        return false;
    }());

    // setup overlay settings
    var settings = merge(defaults, params);

    // 
    var handleAnim = function (anim) {
        if (anim.animationName === "ios-overlay-show") {
            settings.onshow();
        }
        if (anim.animationName === "ios-overlay-hide") {
            destroy();
            settings.onhide();
        }
    };

    // IIFE
    var create = (function () {

        // initial DOM creation and event binding
        overlayDOM = document.createElement("div");
        overlayDOM.className = "ui-ios-overlay";
        overlayDOM.innerHTML += '<span class="title">' + settings.text + '</span';
        if (params.icon) {
            overlayDOM.innerHTML += '<img src="' + params.icon + '">';
        } else if (params.spinner) {
            overlayDOM.appendChild(params.spinner.el);
        }
        if (doesTransitions) {
            overlayDOM.addEventListener("webkitAnimationEnd", handleAnim, false);
            overlayDOM.addEventListener("msAnimationEnd", handleAnim, false);
            overlayDOM.addEventListener("oAnimationEnd", handleAnim, false);
            overlayDOM.addEventListener("animationend", handleAnim, false);
        }
        if (params.parentEl) {
            document.getElementById(params.parentEl).appendChild(overlayDOM);
        } else {
            document.body.appendChild(overlayDOM);
        }

        settings.onbeforeshow();
        // begin fade in
        if (doesTransitions) {
            overlayDOM.className += " ios-overlay-show";
        } else if (typeof $ === "function") {
            $(overlayDOM).fadeIn({
                duration: 200
            }, function () {
                settings.onshow();
            });
        }

        if (settings.duration) {
            window.setTimeout(function () {
                hide();
            }, settings.duration);
        }

    }());

    var hide = function () {
        // pre-callback
        settings.onbeforehide();
        // fade out
        if (doesTransitions) {
            // CSS animation bound to classes
            overlayDOM.className = overlayDOM.className.replace("show", "hide");
        } else if (typeof $ === "function") {
            // polyfill requires jQuery
            $(overlayDOM).fadeOut({
                duration: 200
            }, function () {
                destroy();
                settings.onhide();
            });
        }
    };

    var destroy = function () {
        if (params.parentEl) {
            document.getElementById(params.parentEl).removeChild(overlayDOM);
        } else {
            document.body.removeChild(overlayDOM);
        }
    };

    var update = function (params) {
        if (params.text) {
            overlayDOM.getElementsByTagName("span")[0].innerHTML = params.text;
        }
        if (params.icon) {
            if (settings.spinner) {
                settings.spinner.el.parentNode.removeChild(settings.spinner.el);
            }
            overlayDOM.innerHTML += '<img src="' + params.icon + '">';
        }
    };

    return {
        hide: hide,
        destroy: destroy,
        update: update
    };

};
